A colon (:) is a punctuation mark used to introduce a list, a quotation, an explanation, or an example. It can also be used to separate two clauses when the second clause illustrates or expands upon the first. For example:
- A list: "You will need the following items: a pen, paper, and a ruler."
- An explanation: "She had one goal: to win the championship."
- A quotation: "He said it best: 'Success is not the key to happiness.'"
Colons are often used in formal writing to guide readers to important information that follows.
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